I've got the Tivo HD (not the Premiere), and in the last few weeks, I've started noticing that video on one of the tuners will freeze. However, I notice that this only happens when: (1) I am recording 2 shows (or recording on one tuner and watching live on the other), and (2) when both tuners are displaying in HD. For example, on Sunday, I was recording two NFL games, both on HD. One game recorded fine, but the other game recorded the first 30 minutes and then completely froze. Last night, I was recording How I Met Your Mother and Monday Night Football (both in HD), and the MNF recording froze. When I stopped the MNF recording and watched the game on SD, I did not have the freezing problem. Also, if I am watching 2 shows on HD and pause one tuner to watch the other, the paused tuner will sometimes not come out of pause. I initially thought that I was running out of space on my hard drive and deleted a number of shows that I had already watched and had not deleted. However, I continue to have this problem. I do not know if this is a hard drive failure problem or if there is something wrong with the Cablecard itself. I'm not sure if anyone else has experienced this issue, so if anyone has any suggestions of the possible problem and solution, I'd greatly appreciate it. FYI - I have Cox cable and use their multi-stream cablecard.